Apparatus for grinding, classifying, and decanting ores



I. H. BBOABLEY-p APPARATUS FOR GRINDING, CLASSIFYING, AND DECANTING ORES.

APPLICATION FILED SEPT,- 30, I920.

Z'SHEETS-SHEET I.

Patented June 6,1922.-

J. R. BROADLEY.

APPARATUS FOR GRINDING, CLASSIFYING, AND DECAN HNG ORE S.

APPLICATION FiLED SEPTQ30, I920- I I Patented June 6, 1922;,

2 SHEETSSHEET 2.

umrao STATES PATENT err-ice.

JOSEPH RICHARD BROADLEY, OF LONDON, ENGLAND.

Grinding. Classifying, and Decanting Ores,

of which the following is a specification.

The object of my invention is to provide an improved construction of machine which will combine the functions of a revolving grinding mill of the type usually known as a ball, pebble or tube mill with those of a hydraulic classifier for the purpose of evacuating the material under treatment (hereinafter termed ore) when it becomes suiticiently fine to permit of decantation by suspension in a rising and overflowing current of water.

My invention includes the use of a cylinder divided into two principal compartment-s by a diaphragm provided with apertures to permit the passage of water or other liquid with small particles of ore (hereinafter termed pulp) whilst preventing the passage of larger pieces and of the balls, pebbles or other grinding medium.

In the accompanying drawings Fig. 1 is a longitudinal section of a machine in which the secondary compartment is subdivided for reasons hereinafter explained; Fig. 2 is an end elevation of the baflie plate within the secondary compartment as seen from section line AB in Fig. 1. Fig. 3 is a section on the line CD in Fig. 1, looking towards the bafile plate; Fig. 4 is a longitudinal section of part of a machine in which the secondary compartment is not subdivided; Fig. 5 is a section on line CD in Fig. 1, looking towards the right showing means for returning settled'sands from the secondary compartment to the primary compartment; Fig.

6, is a. section on line E-F in Fig. 1, showing means for subdividing the secondary compartment; Fig. 7, is a section on line G-H in Fig. 1 looking towards the right, showingmeans for constructing the principal diaphragm and Fig. 8, is a section on line JK in Fig. 4, showing an alternative means for constructing the principal diaphragm.

i The primary compartment a of the cylinder is used inthe ordinary manner to reduce the ore b impact and or by attrition with the grin ing medium and the secondary APDARATUS FOR GRINDING, CLASSIFYING, AND DEGANTING ORES.

Specification of Letters Patent. Patented June 6,.1922 Application filed September 30, 1920. Serial No. 413,751.

lindrical formation closed at the end by the head member 9 of the cylinder 71, of the mill, with the exception of a central discharge opening giving exitfor the 'slimes which will pass through a hollow supporting trunnion d resting in a main bearing 11 carrying the-delivery end of the mill.

The secondary compartment 6 is preferably subdivided by an auxiliary diaphragm j provided with a port or ports k at or near thecentre providing passage for pulp collected by a chute or chutes Z communicating from a position at the inner periphery of the cylinder 7:. to the port or ports is thus permitting a difference between the levels of pulp on either side of the auxiliary diaphragm A circular bafile plate m of a size less than the inner diameter of the secondary compartment 12 will be suitably mounted inside the secondary compartment 6 and concentric therewith a suitable distance from the centralv discharge opening of the trunnion d to protect the approach thereto by partially closing the sectional area of the I secondary compartment b allowin'gprogress of the pulp from the diaphragm towards the discharge end of the secondary compartment 6' thus forming a weir through which the pulp must flow with change of direction toreach the discharge opening of the trun-' nion d.

The circular bafile plate m may be pro-- turn tube f allowing passage through the principle diaphragm p separating the primary compartment (1 from the secondary 4 and 8, havin compartment 1) for the purpose of collecting and returning sands to the primary compartment a for further grinding.

The central opening of the return tube f may be extended by lengthening the return tube f to project within the primary compartment a for the purpose of delivering returned sands to a position in the primary compartment. a removed from proximity to the diaphragm p to prevent immediate reentry to the secondary compartment b and or the central opening of the return tube f may be extended by tube 7 to project within the secondary compartment btq reacha position beyond the auxiliary diaphragm to make connection with the radial chute or trough e. The return trunnion 7 may ormay not be attached to or integral with the trunnion d.

The secondary compartment 6 is preferably provided with internal projections or vanes 0 attached to or integral with the shell of the cylinder h for the purpose of guiding the accumulated sands towards the path of the inlet aperture 9 of the chute or trough e. i

The principal diaphragm 12 may be constructed substantially as shown in Figs, 1, and 7, having grids r providing passages for pulp over a comparatively large portion of the sectional area of the cylinder 72,

particularly for the purpose of facilitating" the progress of pulp from the primary compartment a to the secondary compartment b. Alternatively for use particularly when extremely fine grinding of the pulp is desired the principal diaphragm p may be constructed substantially as shown in Figs. ports 8 near the return trunnion f for t e purpose of maintaining a comparatively high level of pulp within the primary compartment a.

It is often desirable to maintain a low level of pulp in the primary compartment a to take advantage of the scouring action of pulp flowing to the seoondar compartment b for'thepurpose of quic 1y removing particles of ore which have already reached the desired fineness and to aocomlish this whilst maintaining the necessary l evel of pulp to provide exit of slimes from the secondary compartment 6 by way of the trunnion al my invention provides for the subdivision of the secondary compartment 1) b means of the auxiliary diaphragm wit chute or chutes Z and port or ports is as hereinbefore described. s

lengthening the return The primary compartment a will be fed i with ore in any ordinary manner through a central opening which may be formed by a hollow supporting trunnion t resting.-in

a main bearing u carrying the feed end of the mill., I Water or other liquigl may be introduced with the ore and or by means of a. pipe 4) projecting through the discharge trunnion d and arranged in any suitable manner.

The pipe 0 may terminate behind or pass through the centre of the baflie m to deliver water to one or both sides of the baflle m for the purpose of diluting the pulp and thereby assisting'settlement of sands.

The eneral construction of the mill and the manner of imparting motion tosame excepting as herein described may be according to ordinary practice with machines of any similar type.

What I claim as my invention, and desire to secure by Letters Patent, is

1. An ore treating apparatus comprising a rotary cylinderprovided at one end with a hollow trunnion constituting an axial ore inlet and at its other end with a hollow trunnion constituting an axial ore outlet, a dividing aperturedpartition in said cylinder forming on the ore inlet side a grinding chamber adapted to contain grinding balls or pebbles and on the ore outlet side a hydraulic classifying chamber having a draulic classifying chamber having a water supply and inwhich the slimes separated by gravity from the sands flow out through the said axial outlet, and a baflie plate in said classifying chamber spaced from the discharge end thereof. I

3. An ore treating apparatus comprising a rotary cylinder provided at one end with a hollow trunnion constituting an axial .ore inlet and at its other end with a hollow trunni0n constituting an axial ore outlet, a dividing apertured partition in said cylinder forming on the ore. inlet side a grinding chamber adapted to'contain grinding balls or pebbles and on the ore outlet side a hydraulic I thereof, said baflle plate or pebbles. and on the ore out classifying chamber having a water supply and in which the slimes separated by gravity from the sands flow out through the said axial outlet, and a bafile plate in said classifying chamber spaced from the discharge end being equipped wlth eccentric vanes to form agitators for the pulp.

4. An ore treating apparatus comprising a rotary cylinder provided at one end with a hollow trunnion constituting an axial ore inlet and at its other end with a hollow trunnion constituting an axial ore outlet, a dividing apertured partition in said cylinder forming on the ore inlet side a grinding chamber adapted to contain grinding balls or pebbles and on the ore outlet side afhydraulic classifying chamber having a'water supply and in which the slimes separated by gravity from the sands flow out through the said axial outlet, and a bafile plate in said classifying chamber spaced from the discharge end thereof, said baflle plate being'in the form of adisk concentric with the classifying chamber with its periphery spaced from the walls of said chamber and provided with eccentric vanes on its opposed faces to form agitators for the pulp.

5. An ore treating apparatus comprising rotary cylinder provided at one end with. a

a rotary cylinder provided'at one end with a hollow trunnion constituting an axial Ore inlet and at its other end with a hollow trunnion constituting an axial ore outlet, a dividing apertured partition in said cylinder forming on the ore inlet side a grinding chamber adapted to contain grinding balls or pebbles and on the ore outlet side a hydraulic classifyin chamber having a water supply and in WlllCll the slimes se arated by gravity from the sands flow out t rough the said axial outlet, an auxilia dividing partition in said classifying gamber spaced from said apertured partition and having ports for the passageof the pulp. I

6. An ore treating apparatus comprisin a rotary cylinder provided at oneend wit a hollow trunnion constituting an axial ore inlet and at its other end with a hollow trunnion constituting an axial ore outlet, a dividing. apertured partition. in said cylinder forming on the ore inlet side a grinding chamber adapted to contain rinding balls let side a hydraulic classifyi chamber having a water supply and in which the slimes separated by gravity from the sands flow out through the different, levels of the trunnion constituting an axial ore outlet, a

dividing apertured partition in said cylinder forming on the ore inlet "side a grindingchamber adapted to contain grinding balls or pebbles and on'the ore outlet side a hydraulic classifying chamber having a water supply and in which the slimes separated by gravity from the sands flow out through the said axial outlet, a longitudinally'arranged,

sand return pipeopenin at its opposite ends into said classifying an respectively, a radially extendingjchute leading from the inlet end. of said ipe to a point adjacent the wall of the classi tying chamber,

and rifiles on said wall for gui into said pipe. a

8. An ore treating apparatus comprising a ing the sands hollow trunnion constituting. an axial ore inlet and at its other end with a hollow trunnion constituting an axial ore outlet, a dividing apertured partition in said cylinder forming on the ore inlet side a grinding chamber adapted to contain grinding balls or pebbles and on the ore outlet side a hydraulic classifying chamber having a water supply and in which the slimes separated by gravity from the sands flow out through the said .axial outlet, a longitudinally arranged sand return pipe opening at its 0 posite ends into said classifying and grin ing chambers respectively, a radially extending curved chute leading from the inlet end of said pipe to a point adjacent the wall of said classifying chamber, and convolute' rifiles on said wall my of for guiding the sands into said pipe.

JOSEPH RICHARD BROADLEY.

Witnesses:

Cms. 'A. Anmson, Wmmnr JAS. Fanny.

grinding chambers 

